A study on performance of galvanic cathodic protection for protecting steel bars in concrete from corrosion | |
| Author | Wikarin Sornthom |
| Call Number | AIT Thesis no.ST-17-01 |
| Subject(s) | Concrete--Corrosion Steel--Corrosion |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-17-01 |
| Abstract | Corrosion of steel bars in concrete can be protected by using galvanic cathodic protection system which is based on an electrochemical reaction of anodic metal. This research evaluated performance of galvanic anode following effects of types of anodic metal including zinc and aluminum, amount of 25% fly ash in concrete mix, and amount of steel bars in protected zone. Behaviors of the sacrificial anode and its effects on chlorideinduced corrosion were investigated. Potential measurement, current determination, weight loss measurement and chloride analysis were monitored. Specimens were molded, cured by moisture curing for 7 days, and accelerated corrosion reaction by applied wetted-dried method for 16 weeks. The results indicated that aluminum anode gave more negative potential than zinc anode but it could also lead to spalling of concrete. Performance of zinc galvanic anode applied to 25% fly ash concrete was quite lower than zinc anode embedded in cement-only concrete. The results also indicated that galvanic anode distributed more negative potential in lower steel densities, and performance of negative potential distribution by the sacrificial anode depended on the surface of steel bar instead of mass of the steel bar. In addition, the galvanic anode could affect to chloride extraction but its performance was insufficient a complete removal of chloride ion. |
| Year | 2017 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-17-01 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai;Raktipong Sahamitmongkol; |
| Examination Committee(s) | Punchet Thammarak;Thanakorn Pheeraphan; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2017 |